I’m currently working on a project that involves a magnetic sensor array consisting of 10 MLX90393 Hall sensors. I am using the ellipsoid calibration method for the magnetometer array, which allows me to obtain a 10×3 scale matrix and an offset matrix.

However, I’ve encountered a problem. After power cycling the device and recalibrating the sensors, I notice that the offset coefficients of some sensors change significantly. I’m unsure if this is normal behavior.

My questions are:

Is it normal for the offset coefficients of the MLX90393 sensors to change significantly after power cycling and recalibration?
If it is normal, what is the reason behind this behavior? How can it be explained?
If it is not normal, what could be causing this issue and how can I resolve it?
Any insights or suggestions would be greatly appreciated.

Thank you!

After power cycling the device and recalibrating the sensors, I notice that the offset coefficients of some sensors change significantly.